Upgrade from Umbraco 10 to 13 made 404 error when calling /mediatype/GetAllowedChildren?contentId=-1

Question

screenshot from Backoffice error

I upgraded Umbraco 10 project to Umbraco 13 but unfortunately I media section not working and cause error when opening it /mediatype/GetAllowedChildren?contentId=-1 returns 404.

And I can't create any media items.

I tried to create new empty database for Umbraco 13 project and Usync settings only but unfortunately this does not solving the issue.

Answer 1

Upgrade from v10 to v13 should be straightforward and it shouldn't cause any issues as you described if done correctly, as the database structure is very similar, if not the same.

I'd recommend you follow the Umbraco documentation and these handy videos and do you upgrade again. From your error, I believe it could be due to some missing Media Types, so you should check them (manually creating them might help resolve some of your issues but again, migrations should be done as described in the following videos.)

Handy resources for upgrades:

https://www.youtube.com/watch?v=aAgmq5Azn4s

https://www.youtube.com/watch?v=075H_ekJBKI

https://www.youtube.com/watch?v=_rQs0oO4uLA